Laws

Question 1

Inverse square law

Answer 1

Beam intensity is inversely proportionate to the distance from a source point

Question 2

15 percent law increase

Answer 2

If your increase your KVP by 15% your exposure doubles

Question 3

Maintenance for 15 percent rules

Answer 3

1

Question 4

Reciprocity law

Answer 4

Same mAs from different MA and time
Example:
3mA • 2s= 6mAs
2mA • 3s= 6MAs

Question 5

Window level

Answer 5

changes in brightness

Question 6

15percent rules decrease

Answer 6

If you decrease your KVP by 15percent your expose rate is halved

Question 7

Maintenance law

Answer 7

If you increase your KVP by 15 percent your exposure is halved

If you decrease your KVP by 15percent your expose is doubled

Question 8

Window width

Answer 8

Controls the financial range on the monitor

Question 9

High density

Answer 9

Lower your mas

Question 10

Low density

Answer 10

Higher your mas

Question 11

Photoelectric effect

Answer 11

Total absorption (gives you contrast)

Question 12

High contrast (60kvp)
Contrast 
Scale
Shades of gray 
KVP

Answer 12

High contrast
Short scale
Few shades of gray
Low KVP

Question 13

Low contrast (100kvp)
KVP 
Shades of gray 
Scale 
Frequency 
Wavelength

Answer 13

Low contrast
Longer scale
More shades of gray
High KVP

Question 14

H and d log 3 other names

Answer 14

Sensitometric

D log e

Question 15

Primary

Answer 15

Photons from source point

Question 16

Secondary

Answer 16

Scatter

Question 17

Remnant

Answer 17

Photons from patient to IR

Question 18

30% rule

Answer 18

30% change in mas is required for viable change in density

Question 19

4-12%

Answer 19

4 to 12 percent in KVP is required for visible change in contrast

Question 20

What relationships does mAs have with density

Answer 20

Directly proportionate

Question 21

Increase in mAs has what affect on contrast

Answer 21

Negligible

Question 22

Increase KVP has what affect on contrast

Answer 22

Goes down (more scatter)

Question 23

Increasing source to image distance has what affect on contrast

Answer 23

Negligible

Question 24

Increasing object to image distance has what affect on contrast

Answer 24

Increase less scatter

Question 25

If I increase my grid what affect will that have on contrast

Answer 25

Increase (less scatter)

Question 26

If I increase my collimation what affect will that have on contrast

Answer 26

Go up (less scatter)

Question 27

Focal spot for both density and contrast are

Answer 27

Negligible

Question 28

If I increase my filtration what will happen to my contrast

Answer 28

Decrease (more scatter)

Question 29

If i increase my Part thickness my contrast will

Answer 29

Go down ( more scatter)

Question 30

Increasing my Atomic # will have what affect on contrast

Answer 30

Increase ( adjacent densities)

Question 31

Increasing Additive pathology will have what affect on contrast

Answer 31

Decrease ( more scatter )

Question 32

If I increase my distructive pathology my contrast will

Answer 32

Increase adjacent densities

Question 33

Increasing Radiopake and radiolucent will affect contrast how

Answer 33

Increase

Question 34

The controlling factor for radiographic contrast is

Answer 34

KVP

Question 35

The digital processing that produces changes I. The range of brightness, so it also is appropriate to use when controlling image contrast. What’s is this called

Answer 35

Window width

Question 36

Two photographic factors allow detail to be seen

Answer 36

Density and contrast

Question 37

An h & d curve demonstrating a steep curve represents image with

Answer 37

High contrast | Think steep curve

Question 38

How’s does the use of filtration affect contrast

Answer 38

Low contrast

Question 39

High energy radiation will result in

Answer 39

Long scale | Low contrast

Question 40

Which of the following will occur if exposure time is increased

Answer 40

Density will increase

Question 41

Which of the following factors will affect Radiographic density

Answer 41

Distance filtration anotomic size

Question 42

Considering reciprocity law which of the following will occur if exposure time is decreased

Answer 42

Mas will increase

Question 43

Which of the following affect radiographic density

Answer 43

(All)average atomic number Thickness of anotomic part Disease processes that decrease tissue density